my iPhone 3G (running on 2.2/unlocked by yellowsn0w) stopped sending SMS without any reason!
it was sending without problem before, now everytime I write an sms then hit send I got "error sending message"
I tried to reset settings, network settings, change SMS center via codes, I even restore it to 2.2, jailbreak and unlock same thing, can't send sms...
I switched SIM cards also, my SIM is working OK with any other phone, even with my other iPhone 3G (official unlock).
the problem only with sending sms, I can receive without problem.
What to do? do I need to reflash baseband? is it yellowsn0w that caused this?
I searched the forum and found nothin